Sound reproducing device



Oct. 10, 1933. J. swALLow SOUND REPRODUCING DEVICE Filed June 15, 1929 2 Sheets-Sheet l @N2/WWW.' fase/n SzIJaZozu J. SWALLOW SOUND REPRODUCING DEVICE Oct. 10, 1933.

Filed June 15, 1929 2 Sheets-Sheet 2 .30 `wherein:

I Patented Oct; 10,1933` Corporation,

`Delaivar'e "l l ,la corporation off i My invention relates to 'soundreprodlicingfdevices of a type commonly employed-'irl `cc'lnnzeczyliOITVlfth radiec'evig S'efS, `lld the invention has amongits other objectsthe `production of '5 fdevicesof thefk'ind described which 'will repro- `"duce soundsefiicientlywithout'distortion thereof.

Particular objectslofjlny'invention'are yto providefimprove'd' meansfor "atuating. y thevr diaphragmof a sound repr'ducer; to providean ini- 'proved *magnetizingf structure lwhich (lo-operates v rrdivap'lilafgm of a sound #reproducing device;

5 vv'vhichji's operatively conl'le'lcteclh to the diaphragm of Aa ,sound reproducing` device; and`l is arranged to' `cci-operate with a*v magnetizingA ,structure j to actuate the diaphragm;` to provide"` improved means for actuating a'soun'd reproducing" device whichcomprisesla plurality o ffdiaphragms', and yto'lprovide 4an improved Fcoin'lyiac'nt`m'agnetizing structure for sound reprodiloing, devices which `comprise a Iplurality of diaphraglns"' actited lb'y ran electric/vll `conductor airang'evdfjto"'cooperate 25rwith the magnetizing struc'tullfe'uv o` vac ztlisgltefthe diaphragm: H

'f pearl fas this j" description progressesf 4 reference being had to' ktheaccornp'ani/ing 'drawings,

Figure 1 is a 'frontgelevationof a. reproducing 'device or a loud` speaker vlfhicll ,embodies `the i'nx'ferition.A

Venlarge'd=""sectio'n Sta "',Referring to thedrawingsWherein Iihavel illustrateda preferred'form'of the finventionfthelrefcylindrical 45 housing membermountedlipon 'a suitable-base 10a.` `Disposed Withinfth'e' housing '1Q are Hdia phragms 11 and "l2-which "are preferlatlply"formedy from' fabric; but ywhich*"rillayhe formed from any suitable material; f VThe diaphragmT 12 `has its Y periphery? rigidly" secured `to the front edge of the v cylindrical housing member 10 by any suitable means and suitablemeansisalso employed to secure the periphery of the diaphragm 11 to a ring 13 which is rigidly secured by'bolts 15, or the r equivalent, to a bar 16,. the barvlbeing rigidly y Alo'yide improved vmeans for supportingfa'V W ding Vorarrhajure rigidly secured bythe bol'ts itoy `ber"45. The sheets 25 and 30 'maybe made of any The d'aphragms 11 and arep 're'ferably tener *trai .portions being rigidly, Secured to vafsleeve 'f19` bymeans :hereinafter described. 'Ij'also `pre- Y A .65 sleeve y19 lspreferably formedgfroi paper l or A' a l phenolic condens'ation"` product, although it may be formedpfrom any `Suitablematerial.`

At lts front end the sleeve-1 9 'lsfpreferablyfprolp'ortion of 'the diaphragm `12 andvtheicentralporl sleeve Projecting into l*the 'sleeve 19; JAlimi secureiglj thereto 'byad'hsliva orany other suitable ,as ,ihe entralportian of the diaphragm lll vbeing lprovided;fvvitlrl anaperture'oi diameter 'substai'lf al to 'the' eil'rternal fdiameten-of the sleeve lll wrm Land .tliel'puter margins are preferably suitable material, such as fabric or the eq'uiva` f llo n The improved speaker includes a magnetizing structure which preferably comprises the magnet member 45 and the magnet member 45 is preferably formed from a barbent to provide a relatively long straight portion 50, at the ends of which are shorter straight portions 51 arranged at right angles to the portion 50. The portion 50 is secured to the bar 16 by thebolts l5. At the ends of the portion 51 are inwardly extending portions 52,*the ends of which preferably abut each other, as indicated at 54 in Fig. 6. A relatively large aperture 55 is formed inthe abutting ends of the magnet member portions 52 and this aperture is concentric with the sleeve 19. Secured to the magnet member portion 50 by a e screw 58, or the equivalent, is a pole piece 59 which projects into the sleeve 19 and into the aperture so that an annular magneticV field is provided between the cylindrical surface of the aperture 55 and the outer end of the pole piece ,v 59. Mounted upon the magnet member portion 52 are windings 60, whereby the magnet member 45 and the polepiece 59 may be energized, it being readily understood that the` windings may be connected to any suitable source of electrical energy.

Disposed in an annular groove 62 formedin the sleeve 19 is an electrical conductor, armature or winding 63 lwhich may be connected to any suitable source of telephonie currents, such as, for

` instance, the output circuit of a radio-receiving set. Whenthe winding 63 is connected to such a source of telephonie vcurrents and the windings 60 are operatively connected to a suitable source of electrical energy, thetelephonic currents flowing into the winding v63 willf react with the annular magnetic field obtaining between the pole piece 59 and the surrounding portion of the magnet member 45. vThe reaction causes the winding 63 and the sleeve 19 to vibrate and vthis vibration is transmitted tothe diaphragms 11 and l2 which translate it into sound.

It is readily understood that flexible arms 48 provided in the sheets .25 and 30 permitvibration of the sleeve 19 and that they holdthe sleeve 19 and the winding 63 concentrically with respect tothe pole piece 59, and the cylindrical' surface of theaperture 55 so that a relatively small `clear,- ance may be provided between the-pole piece 59 land the interior `surface ofthe sleeve 3'1 and relatively littleclearance may be provided between the winding 63 and the cylindrical surface of the aperture 65. Of course,` the lmaterial surrounding the aperture 551s the outer pole piece with respect to the pole piece 59, which may be termed the inner" polepiece.

While I have shown and describedcertain embodiments of my invention', it is to be understood that it is capable of many,rv modifications. Changes, therefore, in the construction andarrangement may be made without kdeparting from the spirit and scope'of` the invention as disclosed in the appended claims, in which it is my intention to claim all novelty inherent in my invention as kbroadly as possible, in view of theprior'art.

What I regard as new, and desire to secure by Letters Patent is: i

1. A device-of the kind described comprising a .plurality of diaphragms, a magnet forming `a magnetic field,y an electrical rconductor disposed in said magnetic eldandinterposed between the diaphragms, and a support for said electrical conductor operatively connected to, said diaphragms to vibrate therewith.

2. A device of the kind described comprising a plurality of diaphragms, a magnet forming a magnetic field, an electrical conductor disposed in said magnetic field, a support for said conductor operatively connected to said diaphragms to vibrate therewith, and flexible means for maintaining said support in alinement with said magnet.

`3. A device of the kind described comprising a plurality of diaphragms, a magnet forming a magnetic field, an electrical conductor disposed in said magnetic field, a support for said conductor operatively connected to said diaphragms to vibrate therewith, and flexible means between said diaphragms for maintaining said support in alinement with said magnet.

4. A device of the kind described comprising ya plurality of diaphragms, a magnet forming a magnetic field, an electrical conductor disposed in said magnetic field and interposed between the diaphragms, a support for said electrical conductor operatively connected to said diaphragms to vibrate therewith, and exible means for maintaining said support in alinement with said magnet.

5. A device of the kind described comprising a plurality of diaphragms, a magnet forming a magnetic field, an electrical conductor disposed in said magnetic. field and interposed between the diaphragms, a support for said electrical Aconductor operatively connected to said diaphragms to vibrate therewith, and flexible means between said diaphragms for maintaining said support in allnement with said magnet.

6. A device of the kind described comprising a plurality of diaphragms, a magnet having an annular magnetic field, a member attached to the central portions of the diaphragms and movable therewith, a winding carried by said member and disposed in said magnetic field, flexible means at one end of said member for maintaining it in alinement with the magnet, and flexible Vmeans at the other end of said member for maintaining it in alinement with said magnet.

'1. kA device of the kind described comprising a plurality of diaphragms, a `magnet having one portion thereof disposed to one side of the diaphragms and another portion thereof disposed `between. the diaphragms, said magnet having poles providing an annular magnetic field, and an annular electrical conductor disposed in said field and operatively connected to said. diaphragms. v

8. A device of the kind described comprising two diaphragms, a member secured to said diafphragms and tensioning them, a magnet provid- ,trical conductor operatively connected to said diaphragmsto vibrate therewith. Y

V JOSEPH SWALLOW. 

